Tagged Stream to PDU
Turns received stream data and tags into PDUs and sends them through a message port.
The sent message is a PMT-pair (created by pmt::cons()). The first element is a dictionary containing all the tags. The second is a vector containing the actual data.
- Length tag name
- The name of the tag that specifies how long the packet is.
This flowgraph can be found at 
- C++ files
- Header files
- Public header files
- Block definition